diff options
Diffstat (limited to 'actionpack/lib/action_view/helpers/form_helper.rb')
| -rw-r--r-- | actionpack/lib/action_view/helpers/form_helper.rb | 61 |
1 files changed, 47 insertions, 14 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb index 63a932320e..fa26aa4640 100644 --- a/actionpack/lib/action_view/helpers/form_helper.rb +++ b/actionpack/lib/action_view/helpers/form_helper.rb @@ -76,7 +76,7 @@ module ActionView # Creates a form and a scope around a specific model object that is used as # a base for questioning about values for the fields. # - # Rails provides succint resource-oriented form generation with +form_for+ + # Rails provides succinct resource-oriented form generation with +form_for+ # like this: # # <% form_for @offer do |f| %> @@ -333,7 +333,7 @@ module ActionView # # => <label for="post_title" class="title_label">A short title</label> # def label(object_name, method, text = nil, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_label_tag(text, options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_label_tag(text, options) end # Returns an input tag of the "text" type tailored for accessing a specified attribute (identified by +method+) on an object @@ -355,7 +355,7 @@ module ActionView # # => <input type="text" id="snippet_code" name="snippet[code]" size="20" value="#{@snippet.code}" class="code_input" /> # def text_field(object_name, method, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_input_field_tag("text", options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("text", options) end # Returns an input tag of the "password" type tailored for accessing a specified attribute (identified by +method+) on an object @@ -377,7 +377,7 @@ module ActionView # # => <input type="text" id="account_pin" name="account[pin]" size="20" value="#{@account.pin}" class="form_input" /> # def password_field(object_name, method, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_input_field_tag("password", options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("password", options) end # Returns a hidden input tag tailored for accessing a specified attribute (identified by +method+) on an object @@ -395,7 +395,7 @@ module ActionView # hidden_field(:user, :token) # # => <input type="hidden" id="user_token" name="user[token]" value="#{@user.token}" /> def hidden_field(object_name, method, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_input_field_tag("hidden", options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("hidden", options) end # Returns an file upload input tag tailored for accessing a specified attribute (identified by +method+) on an object @@ -414,7 +414,7 @@ module ActionView # # => <input type="file" id="attachment_file" name="attachment[file]" class="file_input" /> # def file_field(object_name, method, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_input_field_tag("file", options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("file", options) end # Returns a textarea opening and closing tag set tailored for accessing a specified attribute (identified by +method+) @@ -442,15 +442,44 @@ module ActionView # # #{@entry.body} # # </textarea> def text_area(object_name, method, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_text_area_tag(options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_text_area_tag(options) end # Returns a checkbox tag tailored for accessing a specified attribute (identified by +method+) on an object # assigned to the template (identified by +object+). It's intended that +method+ returns an integer and if that # integer is above zero, then the checkbox is checked. Additional options on the input tag can be passed as a # hash with +options+. The +checked_value+ defaults to 1 while the default +unchecked_value+ - # is set to 0 which is convenient for boolean values. Since HTTP standards say that unchecked checkboxes don't post anything, - # we add a hidden value with the same name as the checkbox as a work around. + # is set to 0 which is convenient for boolean values. + # + # ==== Gotcha + # + # The HTML specification says unchecked check boxes are not successful, and + # thus web browsers do not send them. Unfortunately this introduces a gotcha: + # if an Invoice model has a +paid+ flag, and in the form that edits a paid + # invoice the user unchecks its check box, no +paid+ parameter is sent. So, + # any mass-assignment idiom like + # + # @invoice.update_attributes(params[:invoice]) + # + # wouldn't update the flag. + # + # To prevent this the helper generates a hidden field with the same name as + # the checkbox after the very check box. So, the client either sends only the + # hidden field (representing the check box is unchecked), or both fields. + # Since the HTML specification says key/value pairs have to be sent in the + # same order they appear in the form and Rails parameters extraction always + # gets the first occurrence of any given key, that works in ordinary forms. + # + # Unfortunately that workaround does not work when the check box goes + # within an array-like parameter, as in + # + # <% fields_for "project[invoice_attributes][]", invoice, :index => nil do |form| %> + # <%= form.check_box :paid %> + # ... + # <% end %> + # + # because parameter name repetition is precisely what Rails seeks to distinguish + # the elements of the array. # # ==== Examples # # Let's say that @post.validated? is 1: @@ -468,7 +497,7 @@ module ActionView # # <input name="eula[accepted]" type="hidden" value="no" /> # def check_box(object_name, method, options = {}, checked_value = "1", unchecked_value = "0") - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_check_box_tag(options, checked_value, unchecked_value) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_check_box_tag(options, checked_value, unchecked_value) end # Returns a radio button tag for accessing a specified attribute (identified by +method+) on an object @@ -488,7 +517,7 @@ module ActionView # # => <input type="radio" id="user_receive_newsletter_yes" name="user[receive_newsletter]" value="yes" /> # # <input type="radio" id="user_receive_newsletter_no" name="user[receive_newsletter]" value="no" checked="checked" /> def radio_button(object_name, method, tag_value, options = {}) - InstanceTag.new(object_name, method, self, nil, options.delete(:object)).to_radio_button_tag(tag_value, options) + InstanceTag.new(object_name, method, self, options.delete(:object)).to_radio_button_tag(tag_value, options) end end @@ -501,9 +530,9 @@ module ActionView DEFAULT_RADIO_OPTIONS = { }.freeze unless const_defined?(:DEFAULT_RADIO_OPTIONS) DEFAULT_TEXT_AREA_OPTIONS = { "cols" => 40, "rows" => 20 }.freeze unless const_defined?(:DEFAULT_TEXT_AREA_OPTIONS) - def initialize(object_name, method_name, template_object, local_binding = nil, object = nil) + def initialize(object_name, method_name, template_object, object = nil) @object_name, @method_name = object_name.to_s.dup, method_name.to_s.dup - @template_object, @local_binding = template_object, local_binding + @template_object= template_object @object = object if @object_name.sub!(/\[\]$/,"") if object ||= @template_object.instance_variable_get("@#{Regexp.last_match.pre_match}") and object.respond_to?(:to_param) @@ -601,7 +630,11 @@ module ActionView end def object - @object || (@template_object.instance_variable_get("@#{@object_name}") rescue nil) + @object || @template_object.instance_variable_get("@#{@object_name}") + rescue NameError + # As @object_name may contain the nested syntax (item[subobject]) we + # need to fallback to nil. + nil end def value(object) |